1 / 19

EMC Barrel Electronics Status

This document discusses the location and structure of the front-end electronics in the EMC barrel, as well as the data transmission unit. It also covers the setup and test results of the crystals and preamplifiers. The modifications made to the integrator time constant of the original Babar preamp to reduce pile-up in SuperB are also presented.

thenry
Télécharger la présentation

EMC Barrel Electronics Status

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. EMC Barrel ElectronicsStatus Valerio Bocci INFN Roma 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  2. Location of the Front End electronics in the EMC barrel Data Transmission Unit (ex IOB) 40 DTU Slac Visit 25 Nov 2011 40 DTU 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  3. 21 Crystals Calorimeter Module(40 (phi) x (4+4) (theta) = 320 modules) Cooling pipe 21 Preamp Boards inside this two windows 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  4. Crystals Moudule 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  5. Preamplifier Asssembly Epoxy Glue 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  6. Way to replace Preamps Remove Extenal shiel Remove the coling pipes Access and Replace Preamp

  7. EMC Barrel readout granularity X 2 Side (Fwd,Bck) FWD Mini Crate 7 7 7 3 3 8 8 8 3 BWD Mini Crate • One phi row of 3(phi) x 24 (theta) Crystals is read out from same module • Physical Module = 3 * 7 =21 Crystals and 3*6 =18 last bkw • Trigger Tower =3*8=24 Crystals in Babar proposed 3*4=12 in SuperB • One optical fiber for two trigger module (3 optical fiber) 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  8. Mini Crate structure Custom Backplane Preamp connection Optica Fiber Digitizer Board Connection Boards 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  9. Connection Board • 12 input cables from preamps • Distribution of PINs Power supply • Connected to Backplane board 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  10. Mini Crate Backplane 6 Slots robust connection 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  11. EMC Barrel Trigger Primitives (As before) • EMC Barrel :5760 CsI(Tl) Crystals • 480 Sums unit Warning: The 3 phi Crystal constraint request A Chamber design with multiple of (360/40*3)=3 deg granularity at external layer Sum of the energy deposition of 12 crystals of the barrel module any sample time 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  12. Crystals Test Box 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  13. Crystals Test Box 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  14. Setup 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  15. Time jitter of the APD signals fromCsI(Tl) crystal • Signal from external scintillator (PM readout) • Signal from CsI(Tl) (PM readout) • Signal froma CsI(Tl) (APD readout) • DSP d(apd)/dt to found the maximum • Jitter measurements 48 ns RMS 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

  16. Test of modification of the integration constant of the original Babar preamp to reduce pile up in SuperB(Measuraments from Luigi Recchia )Rf=200M Cf=1pF -> Rf=2M Cf=1pF (Measuraments from Luigi Recchia) Cosmic signal Rf=200M (Original ) Cosmic signals Rf=2M

  17. Preliminary test results of the Babar integrator time constant modification to work with higher rate and backgrond of SupeB.(Measuraments from Luigi Recchia ) Modificated FRONT-END: • Pulse positive width 2.2us • undershot about 4 us • Total pulse width 6.5us -> RATE MAX= 150KHz ORIGINAL FRONT-END: • Pulse positive width 6us • undershot about 20 us • Total pulse width 25us -> RATE MAX= 40KHz?!

  18. TDR EMC BARREL: • Babar Mechanical constraint for electronics • Electronics changes • Rationale for changes • Premp design • Shaping and digitization • concentration and data transmission • Cabling Forward: • Readout and Electronics • APD Readout • Electronics Block diagram • Preamplifier • Shaper • Digitization • concentration and data transmission • Requirements on mechanics

  19. Conclusions • The Mechanical structure of the Barrel give some strong physical • constraint to electronics design • It is impossible without risking to destroy the assembly to substitute the PIN diodes. • The form factor of the new preamplifier must be the same of the old one • The substitution of the Preamplifier it is not trivial but feasible (order 1 yr man pwr) • The Phi granularity for the readout and for the trigger is fixed • (3 cystals =>9 deg) it is preferable that the Chamber follow this granularity. • New Preamp,New (Digitizer + trigger sum),New Data Transmission • Test working in progress differents crystals differents preamp configuration 2nd SuperB Collaboration Meeting @ INFN-LNF13-16 Dec 2011 Valerio Bocci

More Related